Biological treatment method and treatment device for amine-containing waste water

[0044] [Example]

[0045] Hereinafter, the present invention will be described in more detail by citing experimental examples, examples, and comparative examples.

[0046] In the following experimental examples, examples and comparative examples, in the following water quality from the ultrapure water recovery system of the liquid crystal factory, the amine-containing organic wastewater is added to the water with a pH of 9.5 after adding nutrients as shown below Sulfuric acid adjusts the water to a pH value of 7.5 and treats it as raw water.

[0047]

[0048] TOC value: 103mg / L

[0049] Main ingredient: Monoethanolamine

[0050] Other ingredients: N-methylformamide, TMAH, etc. (The total of monoethanolamine, N-methylformamide and TMAH is more than 90% of the total TOC value)

[0051] In addition, the above organic wastewater contains almost no P, Ca, K, Mg, Na, S, etc., so disodium phosphate and monopotassium phosphate are added to make the total addition amount in terms of phosphorus 1m

[0052] [Experimental example 1]

[0053] 3 L aeration tanks and 3 tanks are discharged in series, and each aeration tank is filled with a 10 mm square polyurethane sponge carrier of 20% by volume to form a biological treatment device, and the biological treatment device is used to perform biological treatment of raw water. Install a pH meter in the first aeration tank (aeration tank of the first stage) and the third aeration tank (aeration tank of the third stage), and add 1N NaOH aqueous solution when the measured value of the pH meter drops to 7.0 . All the 3 tanks were ventilated to 3vvm, a small amount of biological sludge from Johkasou wastewater was added in other locations, and the raw water was continuously passed through the 3 aeration tanks to start treatment. The residence time of the aeration tank was 3 hours each, and the total was 9 hours.

[0054] As a result, the TOC value (solubility TOC value) of the treated water (outflow water from the third aeration tank) on the

[0064] [Example 1]

[0065] Install a pH meter in the first aeration tank and the third aeration tank, and set to automatically add 1N H to each aeration tank when the measured value of the pH meter exceeds 8. 2 SO 4 For the aqueous solution, the treatment of Comparative Example 1 was continued.

[0066] As a result, the TOC value of the treated water became 5 mg / L or less after 3 days, and the ammonia nitrogen concentration of the treated water also became 1 mg / L or less after one week.

[0067] Therefore, the load is tripled. As a result, after 5 days from the load increase, the TOC value of the treated water was 5 mg / L or less, and the ammonia nitrogen concentration of the treated water was 1 mg / L or less, and the condition was stable. After that, the treatment did not deteriorate.